Only for certain fonts at certain sizes, and only if you have the SDF generated ahead of time, both of which mean that the technique isn't general enough to ren

Only for certain fonts at certain sizes, and only if you have the SDF generated ahead of time, both of which mean that the technique isn't general enough to render arbitrary fonts in .otf format. Rasterizing small glyphs is super fast anyway, there's not much of a need to accelerate it if you can just cache the glyph bitmaps.